Now Itunes offers multi language support where you can not only choose your default language but also translate you app meta data for each country you offer app in.
Here is what it states:
You can now edit the default language of your app’s metadata on iTunes
Connect at the app level and it can be changed at any time. Customers
are more likely to read about your app if they can do it in their native
language, and we encourage you to translate your metadata for each of
the countries in which you offer apps.
To edit the default language for an app, go to the Manage Your Applications
module, then click Edit for your App Information. Any previously added
localizations will be available for selection in the Default Language
dropdown. If you wish to add a new localization to your app, you can do
so from the App Localization section of your app’s version details page.
Adding a new localization will require a binary update so that Apple
can review it.
If you need assistance translating your metadata into additional languages, there are third party vendors who can provide internationalization and localization services for your app.